CN101265692B

CN101265692B - Pavement marker

Info

Publication number: CN101265692B
Application number: CN2008100854482A
Authority: CN
Inventors: 保罗·斯纳格尔; 戴维·朗格兰斯; 斯万安德·萨尔德塞
Original assignee: Stimsonite Corp
Current assignee: Stimsonite Corp
Priority date: 2003-06-09
Filing date: 2004-05-25
Publication date: 2012-05-30
Anticipated expiration: 2024-05-25
Also published as: US20040247387A1; CN101265692A; CA2527279A1; RU2365701C2; AU2009201630B2; AU2004248115B2; CN1802473A; BRPI0411384A; RU2005136012A; AU2009201630A1; AU2004248115A1; EP1641979B1; US6851888B2; HK1124097A1; KR101194929B1; CA2527279C; EP1641979A2; ES2436607T3; KR20060025164A; WO2004111343A2

Abstract

A pavement marker has a base having at least one opening formed therein. A groove is formed in the base substantially adjacent the opening. The pavement marker further includes a cover for covering the opening in the base. The cover is formed with at least one energy directing rib configured for nesting with the groove in the base. The cover is ultrasonically welded to the base so that the energy directing rib melts and integrally fuses to portions of the base adjacent the groove.

Description

Pavement marker

The application is that the name submitted on May 25th, 2004 is called the dividing an application of one Chinese patent application 200480015881.9 (PCT/US2004/016443) of " pavement marker ".

Technical field

The present invention relates to a kind of reflection and/or emission light pavement marker with identification track selection area.

Background technology

Pavement marker is fixed on the road surface or helps direct drivers in the road surface along seeing preferred travel lanes.Typical pavement marker comprises that a plurality of selections carry out the separating component of concrete function.For example, a kind of typical pavement marker can comprise that base portion and at least one are installed to base portion so that produce the light emission or the reflecting plate that can be clear that by the driver near pavement marker.The base portion that is installed in lip-deep pavement marker can be formed and can be comprised the bottom surface that is configured to be fixed on the road surface by moulded in thermoplastic material.Base portion can also comprise the end face that is configured to hold light emission and/or reflecting plate.

Thick injection-molded product need solidify and bring indenture or the irregular possibility of other size for a long time.So most of injection-molded products are formed with the heart hole (coring hole) that a row is separated by the cell matrix of thermoplasticity web.It is consistent basically that web is designed to thickness.The thickness of web is selected as the sufficient intensity that guarantees thermoplastic product and realizes that thermoplastic solidifies basically uniformly with arranging.The base portion that is installed in lip-deep pavement marker designs intentionally hole for above-mentioned reason usually.

About on the pavement marker base portion or the fore-and-aft direction heart hole of extending can influence the intensity of base portion and can cause owing to the impact of vehicle tyre was lost efficacy.The heart hole of extending at above-below direction is not easy to form and the relevant stress that lost efficacy.Yet, extend down into the gathering that the cover plate that the heart hole of top base surface need separate prevents liquid or chip.Heart hole can cover with the lens or the reflecting plate of pavement marker.

Assignee of the present invention confirms that bigger soffit helps pavement marker is remained in the position fixing on the road.Therefore the heart hole that extends into the pavement marker bottom surface will inevitably reduce surface area, and the road pavement sign remains on adverse influence is arranged on the road.Same unsettled U.S. Patent application No.10/442,336 disclose a kind of pavement marker with bottom plate, the surface area of said bottom plate sealing heart hole and increase bottom.

The above-mentioned parts of pavement marker must be fixed to each other tightly.Ultra-sonic welded is this a lot of manufacturing advantages and the efficient of fixedly providing.For example, ultra-sonic welded has avoided selection to treat all difficulties of compatible suitable bonding adhesive of gluing material with two kinds.In addition, ultra-sonic welded has avoided using the additional fabrication steps of bonding adhesive, also has and the relevant EHS problem of some bonding adhesive of use.

Typical ultrasonic welding device is used to support anvil (anvil) of one of object to be welded and the horn-like thing (hom) that another object to be welded is relatively arranged.Horn-like thing applies high-frequency sound energy near the welding position of selecting.Acoustic energy activates the molecule in the plastics and causes near the plastic molting that applies the acoustic energy.Plastics will soon harden and two kinds of materials will weld after ultrasonic energy stops.Can be through ultrasonic energy being applied to panel opposite or the position on the cover plate with dividing the web in estrangement hole, thus ultrasonic energy is used for above-mentioned pavement marker.Ultrasonic energy tends to melt or the thermoplastic of softening panel or cover plate, so that the thermoplastic fusion of the melting heat plastics of panel or cover plate and opposite web.

The molten material that ultra-sonic welded produced tends to outwards expand from the central cross that ultrasonic energy applies.Thereby the plastics of fusing will flow away from the panel on the support pavement marker or the web of cover plate.The wide pond of these melting heat plastic materials is with after-hardening.Yet the major part in plastic hardening pond is for the very little or not effect of contribution that is fastenedly connected of panel or cover plate and base portion.Therefore, the time that energy that is consumed and ultra-sonic welded are distributed not is always suitable with resulting benefit.In addition, the intensity of some ultra-sonic welded possibly be not enough to bear the stress that vehicle tyre applies.

Some pavement markers comprise that design comes the fluorescence top board of edge-lit.More specifically, in the road sign top, launch the bottom surface and/or the end face of fluorescence photon and bump top board.Fluorescence photon with suitable angle bump end face and bottom surface will lead in internal reflection and in panel again.Thereby the major part in the photon of these internal reflections is just gone out from the edge-emission of panel and is produced the edge glow that the driver can see clearly.Desirable pavement marker is designed to maximize edge glow.Any geometry that departs from smooth flat of panel will make photon break away from, and therefore reduces the effect of edge glow.Above-mentioned ultra-sonic welded pattern has produced the wide plastics melt (frozen puddle) that condenses effectively, thereby and the substance that has formed with the initial planar surface of plastics depart from.So ultra-sonic welded can reduce the edge glow effect.

Summary of the invention

The present invention relates to a kind of pavement marker, it has at least the first and second parts that ultra-sonic welded is each other got up.First parts are formed with that groove is dredged at least one welding and second parts are formed with at least one energy drag rib, and when first and second parts were correctly assembled, said energy drag rib embedded groove.The ultra-sonic welded at the interface that first and second parts are dredged groove in energy drag rib and welding.So the surface that cooperatively interacts that is limited at cooperation side and base portion rib and groove just exists integrally-built welding.So, just define bigger, measurable and more effective join domain, and correspondingly have the combination potentiality of increase and stronger combination to ultra-sonic welded.

First parts preferably include a plurality of welding and dredge groove, and second parts preferably include corresponding a plurality of energy drag rib.Ultra-sonic welded preferably is applied to a plurality of ribs that cooperatively interact and groove.Groove is dredged in welding in first parts can limit sunk area in a surface of first parts.Alternatively, the welding in first parts is dredged groove and can be limited between the pair of rib on first parts.Thereby the rib of second parts just is embedded on first parts in the groove between the pair of rib.

Energy drag rib on second parts can be used for forming a good zone that limits by sensing at first, is used to receive ultrasonic energy, and this will obtain to be welded to connect between first and second parts.Groove on first parts can limit rectangular cross section.The cross sectional area of rib and groove can be about equally so that the material of rib filling groove basically after ultra-sonic welded, so that maximization combines potentiality.

First and second parts are preferably formed by plastics.More specifically, first parts can and can be formed with injection moulding and the curing of a plurality of hearts hole to make things convenient for plastics by injection-moulding plastic.Heart hole preferably is separated from each other by webs of plastic, and groove can be formed in the web of first parts.

First parts of pavement marker can limit the base portion of an integral body and can construct on the surface that is installed in road.Second parts can be the bottoms that structure covers the heart hole in the base portion bottom surface.Additionally or alternatively, second parts can be installed on the end face of base portion and by plastics form with light is directed near the optics of vehicle.

The present invention also aims to provide a kind of method that is used to make pavement marker.This method comprises that first parts of molded pavement marker dredge groove to comprise at least one welding.This method comprises that also second parts that form pavement marker are to comprise at least one energy drag rib.This method is carried out through assembling first and second parts, so that the rib of second parts fits into the groove of first parts.This method is applied to basically ultrasonic energy with the rib that cooperatively interacts and the corresponding basically zone of groove so that the material of the second parts is molten into the regional soldered engagement that is limited groove with first parts subsequently at least.

The step that forms first parts in this method can comprise by plastics and forms first parts, and can comprise the said plastics of injection moulding particularly.Injection moulding preferably is performed and forms a plurality of grooves that are used for the corresponding a plurality of energy drag ribs of embedded second parts.The injection moulding step can be carried out and in first parts, form a plurality of hearts hole, and at least one groove can be limited on the web that a plurality of hearts hole is separated.

The step that forms the energy drag rib in this method can comprise that formation has the rib at most advanced and sophisticated edge, and the step of formation groove can comprise that formation has the groove of substantial rectangular cross section in this method.The formation of rib and groove preferably is performed and makes groove define the cross sectional area that equals rib at least.Thereby the ultra-sonic welded step will cause rib fusing and filling groove basically, and form the surface between the inner surface of rib and groove and combine.Yet the ultra-sonic welded step can not form unnecessary welding, and this unnecessary welding can hinder the correct installation of first and second parts.Ultra-sonic welded can be carried out and obtain sealing.

Description of drawings

Fig. 1 is according to the decomposition diagram of the pavement marker of first embodiment of the invention, above this pavement marker, sees.

Fig. 2 is the decomposition diagram of pavement marker shown in Figure 1, below this pavement marker, sees.

Fig. 3 is the upward view of pavement marker base portion.

Fig. 4 is the viewgraph of cross-section of 4-4 line institute intercepting in Fig. 3.

Fig. 5 is the viewgraph of cross-section of 5-5 line institute intercepting in Fig. 3.

Fig. 6 is the phantom drawing of bottom when seeing from above.

Fig. 7 is the top view of bottom.

Fig. 8 is the viewgraph of cross-section of 8-8 line institute intercepting in Fig. 7.

Fig. 9 is the upward view of the pavement marker of assembling.

Figure 10 is the viewgraph of cross-section of 10-10 line institute intercepting in Fig. 9.

Figure 11 is a viewgraph of cross-section, and it illustrates welding embedded rib and groove before.

Figure 12 is a viewgraph of cross-section, and it illustrates rib and groove after the welding.

Figure 13 is the decomposition diagram of the pavement marker optional according to the present invention.

Figure 14 is the upward view of pavement marker shown in Figure 13.

Figure 15 is the viewgraph of cross-section of 15-15 line institute intercepting in Figure 14.

Figure 16 is the viewgraph of cross-section of 16-16 line institute intercepting in Figure 14.

Figure 17 is the upward view of bottom.

Figure 18 is the phantom drawing of the pavement marker of assembling.

Figure 19 is the viewgraph of cross-section of 19-19 line institute intercepting in Figure 18.

The specific embodiment

Pavement marker according to the present invention generally is identified as Reference numeral 10 in Fig. 1 to 12.Pavement marker 10 comprises base portion 12, bottom 14 and preceding and rear lens 16 and 18.Base portion 12 forms and comprises bottom 20 (being clearly shown that among Fig. 2) and opposite top 22 (being clearly shown that among Fig. 1) by thermoplastic is integrally molded.With rear lens recess 26 and 28, be respectively applied for and hold preceding and

rear lens

16 and 18 before top 22 is formed with.

Lens

16 and 18 can be fastened in corresponding lens recess 26 and 28 through bonding adhesive or mechanical connection manner.The others of the top 22 of base portion 12 and the shape of

lens

16 and 18 and function are not crucial for the first embodiment of the present invention and do not further describe here.Yet the structure at pavement marker top more is correlated with the second embodiment of the present invention with function and in the content of relevant second embodiment, will be described in more detail.

The bottom 20 of base portion 12 comprises neighboring 30 and 30 perimeter zones 32 that extend internally from the neighboring.Perimeter zone 32 is characterised in that at least one row swells 34 spaced apart recesses 33 by V-arrangement.Protuberance 34 defines the summit that is in basically in the common plane.The groove 33 that this row strides across perimeter zone 32 has increased the surface area of bottom 20 and has therefore increased the ability that pitch or other bonding adhesive remain on pavement marker 10 position of fixing basically on the road surface with protuberance 34.

The bottom 20 of base portion 12 also comprise a plurality of from the perimeter zone 32 inwardly at interval and to each other by web 38 isolated heart holes 36.Thereby heart hole 36 be used for realize on the base portion 12 the consistent basically thickness of plastics guarantee plastics solidifying after the size of unanimity basically.Therefore, the thickness of web 38 equates basically.Web 38 has lower end 40, and it defines a common basically plane, the plane parallel that is limited protuberance 34 on this plane and the perimeter zone 30.Yet the plane that is limited the lower end 40 of web 38 is with respect to the upwards skew of plane that limits with protuberance 34.Thereby bottom 20 defines the depression 42 that can surround heart hole 36 and web 38.The lower end 40 of each web 38 is characterised in that central recess 44.Each groove 44 is for the essentially rectangular cross section and comprise end face 46 and opposite side 48.The side is outwards opened and is begun in farther distance away from each other with convenient molded from end face.The degree of depth of each groove " a " is preferably 0.01 to 0.03 inch, and is most preferably about 0.018 inch.The periphery that groove 44 also forms around depression 42 extends.

Bottom 14 is flat-shaped basically rectangle, and has the corresponding basically neighboring of shape of the depression 42 in the bottom 20 with base portion 12.More specifically, bottom 14 comprises bottom surface 50 (as shown in Figure 2) and opposite end face 52 (like Fig. 1, shown in 6 and 7).Bottom surface 50 is formed with the groove 53 that a row is separated from each other by protuberance 54.The summit of protuberance 54 has limited a common basically plane.Thereby the combination of groove 53 and protuberance 54 is used for surface area that certain degree ground increases the bottom surface 50 of bottom 14 to be strengthened bottom 14 and is used to pavement marker 14 is remained on the power that pitch and other bonding adhesive on the road surface are kept.

The end face 52 of bottom 14 is characterised in that row's energy drag rib 56, and the web 38 that they are arranged as on the bottom 20 with base portion 12 aligns.Each rib 56 comprises a pair of substantially parallel side 58 and a pair of convergence face 60 that converges along the edge 62 of substantial linear.Interval between the lateral edges 58 of each energy drag rib 56 is less than the interval between the lateral edges 48 of each groove 44.Yet the height of each rib 56 " b " is approximately 0.3 to 0.4 inch and be preferably about 0.35 inch.More specifically, the height of each rib 56 " b " surpasses the degree of depth of corresponding recesses 44.Edge 62 between the gradually thin surface 60 and the every pair of gradually thin surface 60 defines the energy director that is described below.

Pavement marker 10 is assembled through utilizing known technology (such as bonding adhesive and mechanical fixation) that

lens

16 and 18 are separately fixed in lens recess 26 and 28.The end face 52 of bottom 14 upwards compresses the depression 42 in the bottom 20 that gets into base portion 12 subsequently, and is shown in figure 11.So, in the groove 44 that the rib 56 on the end face 52 embeds in the bottom 20 that is formed on base portion 12, shown in figure 11.The pavement marker 10 of assembling is provided to ultrasonic welding device subsequently.More specifically, ultrasonic welding device comprises horn-like thing (horn), and it is configured to and energy drag rib 56 substantial registration.Exert pressure and ultrasonic energy through horn-like thing subsequently, so that edge 62 fusings on the energy director that is limited thin surface 60 gradually and each rib 56 and integrally being fused with the plastics of encirclement corresponding recesses 44 are shown in figure 12.The side 48 of each groove 44 is used for dredging and comprising the molten plastic of respective rib 56.So molten plastic is just still less expanded and more effectively bottom 14 is remained in the depression 42 of base portion 12.

An optional embodiment of pavement marker generally is designated Reference numeral 70 in Figure 14 to 20.Pavement marker 70 comprises base portion 72, preceding and

rear lens

74 and 76 and top cover 78.

Base portion 72 forms and comprises opposite preceding and

back edge

80 and 82 and opposite first and second

lateral edges

84 and 86 by duroplasts is integrally molded.Base portion 72 also comprises bottom 88, and the bottom is characterised in that many row's grooves 90 and V-arrangement protuberance 92.Groove 90 and protuberance 92 are used for increasing the surface area on the bottom surface 88 of base portion 72.Not all groove 90 is all parallel with protuberance 92.In the embodiment shown, bottom 88 is divided into four quadrants.Groove 90 in each quadrant is parallel with protuberance 92, but is substantially perpendicular to groove 90 and protuberance 92 in the adjacent quadrant.Thereby pavement marker 70 is unlikely owing to vehicle tyre causes laterally slippage in pitch and other bonding adhesive in the power that applies on the pavement marker 70.

The bottom 88 of base portion 72 has a plurality of hearts hole 94, but the number in heart hole is than the much less in the bottom 20 of the base portion 12 of first embodiment.In addition, do not cave in the base portion 88 of base portion 72.Therefore, pavement marker 70 need not above about described in first embodiment and the bottom that illustrates.

Base portion 72 also comprises end face, and the top of the base portion 12 shown in itself and first embodiment differs widely.More specifically, base portion 72 comprises from leading edge 82 upwards and intilted front surface 100 and from back edge 82 upwards and surface, sweptback back 102.Upwards extend to front curve and between front surface 100 and surface, back 102 from each first and second

lateral edges

84 and 86 first and second sides 104 and 106.

Side

104 and 106 characteristic are manipulation and the placement of finger-

like handle

108 and 110 to make things convenient for pavement marker 70 of concave surface respectively.

Front surface 100 is characterised in that front lens recess 112, and it has a plurality of to the front center hole 114 that extends below, and these heart holes are separated by a plurality of leading webs 116, shown in Figure 13 and 16.Leading web 116 has the top edge that is in basically in the common plane.Front lens recess 112 is designed and is configured to hold front lens 74 tightly, so that the right to the outside part of front lens 74 is concordant with the part of front surface 100 contiguous front lens recess 112 basically.Front lens 74 can be fixed in the front lens recess 112 through gluing welding and machanical fastener.Consider this connection, the heart hole 114 in the front lens recess 112 is covered by front lens 74.

Back surface 102 is formed and comprises rear lens recess 118, and has hearts holes, a plurality of back 120, and these heart holes are separated from one another by a plurality of trailing web 122, shown in Figure 13 and 16.Trailing web 122 comprises the top edge 122 that is in basically in the common plane.Rear lens recess is configured to receive rear lens 76, so that the outer surface of upper of rear lens 76 is concordant with the part of surface, back 102 contiguous rear lens recess 118 basically.Rear lens 76 can be fixed in the rear lens recess 118 through the same way as that front lens 74 is fixed in the front lens recess 112.

Base portion 72 also comprises cap recess 124, and it extends upward in front and back between front lens recess 112 and rear lens recess 118, shown in Figure 13 and 15.In addition, cap recess 124 extends upward at right and left between first and second sides 104 and 106.Base portion 72 comprises a plurality of to the heart hole 126 that extends below corresponding to the zone of cap recess 124, they are spaced apart from each other by the web 128 of a row of cells.In addition, heart hole 128 is at interval inside by peripheral steps 130, and said peripheral steps is extended around the whole periphery of cap recess 124.Web 128 has top 132 with peripheral steps 130, and these tops are located substantially in the common plane parallel with the bottom of base portion 72 88.Cap recess 124 is configured holds top cover described here 78.

Each web 128 comprises supine web groove 134.In addition, peripheral steps 130 comprises the continuous peripheral groove 136 of extending around the entire circumference of cap recess 124.Groove 134 and 136 have substantially the same shape of cross section and basically with the depression 32 of the base portion 12 described in first embodiment in the shape of cross section of groove 44 identical.More specifically, each groove 134 and 136 has the rectangular cross section of enlarging basically, and bottom surface and side a little remotely separate each other.Each groove 134 and 136 has the substantially the same degree of depth with the groove 44 described in first embodiment.

Top cover 78 is integrally formed by epipolic plastics (trade mark of selling such as General Electric is the Merlon of LEXAN

).Top cover 78 comprises flat-shaped basically end face 140 (shown in figure 13) and opposite bottom surface 142 (shown in figure 17).Bottom surface 142 is characterised in that a row to the energy drag rib 144 that extends below, its design and be configured to embed the groove 134 in the web 128 that is formed in the base portion 72.In addition, the bottom surface 142 of top cover 78 comprises that it embeds peripheral groove 136 around the continuous peripheral energy drag rib 146 of the whole periphery extension of the bottom surface 142 of top cover 78.Energy drag rib 144 and 146 shape of cross section and size basically with the bottom that is formed at first embodiment 14 on the shape of cross section and the size of energy drag rib 56 consistent.

Pavement marker 70 is assembled preceding being fixed in preceding and the rear lens recess 112 and 118 with

rear lens

74 and 76 through utilizing conventional fixed form (such as bonding adhesive, welding or mechanical fixation).Top cover 78 retraction cap recess subsequently 124.So, energy drag rib 144 loosely retraction web grooves 134.Simultaneously, peripheral energy drag rib 146 retractions are continuously around the peripheral groove 136 of top cover 78 periphery.The pavement marker 70 of assembling is provided to ultrasonic welding device subsequently.This device comprises horn-like thing (horn), and it is aimed at energy drag rib 144 and 146 basically.Exert pressure and ultrasonic energy to top cover 78 subsequently.So energy drag rib 144 and 146 plastic molting are also filled corresponding grooves 134 and 136.So, energy drag rib 144 and 146 and the part of base portion 72 adjacent recess 134 and 136 between just formed the combination of globality.This welding region defines around continuous tight seal around the top cover 78, thereby has prevented that moisture is packed into the heart hole 126 in the base portion 72.Moisture can influence the optical property and the edge glow of the fluorescent material that forms top cover 78.The plastics of fusing can influence the internal reflection of photon in the top cover 78.Energy drag rib 144 and 146 and the embedded layout of groove 132 and 134 has reduced the expansion of molten material and molten material dredged get into less transverse area.So certain degree ground has reduced the adverse effect of ultra-sonic welded for the optical property of the fluorescent material that forms top cover 78.

Though described the present invention to particular specific embodiment,, can make a lot of variations obviously not departing under the scope that the present invention is defined by the following claims.For example, being meshing with each other of groove and energy director can be applied to lens recess and lens in first or second embodiment.The groove and the energy director of groove and energy director and other structure of other pattern also can be provided in addition.

Claims

1. pavement marker (10; 70), it has base portion (12; 72) and cover plate (14; 78), base portion (12; 72) has the bottom surface (20 that is used to be placed on the road surface; 88) and opposite end face (22; 124), base portion (12; 72) be formed with depression (42; 124) and a plurality of depression (42 that is formed at; 124) in and by web (38; 128) heart hole (36 that is separated from each other; 126), cover plate (14; 78) be configured to and cave in (42; 124) be complementary and cover heart hole (36; 126), cover plate (14; 78) be ultrasonically welded to web (38; 128), wherein:

Groove (44; 134) be formed at web (38; 128) face cover plate (14 in the surface; 78), base portion (12; 72) also comprise around depression (42; 124) peripheral groove (44 of periphery extension; 136), each peripheral groove (44; 136) and web (38; 128) groove (44 in; 134) all have a pair of opposite side (48) and the surface (46) of between side (48), extending, cover plate (14; 78) has the energy drag rib (56 that has opposite sides (58); 144,146), each energy drag rib (56; 144,146) interval between the opposite sides (58) is less than each groove (44; 134,136) interval between the opposite sides (48), energy drag rib (56; 144,146) embed groove (44; 134,136) and by ultrasonic fusing fully with airtightly with cover plate (14; 78) be sealed in base portion (12; 72), and each groove (44; 136) side (48) is used for dredging and makes corresponding energy drag rib (56; 144,146) molten material is included in groove (44; 134,136) in.

2. according to the pavement marker of claim 1, its further groove (44; 134,136) cross sectional area is substantially equal to energy drag rib (56; 144,146) cross sectional area is so that energy drag rib (56; 144,146) material will be filled corresponding grooves (44 basically after by ultrasonic fusing; 134,136) thus the maximization base portion (12; 72) and cover plate (14; 78) combination between.

3. according to the pavement marker of claim 1 or 2, wherein base portion (12; 72) and cover plate (14; 78) each is all formed by plastic monoblock ground.

4. according to pavement marker arbitrary in the claim 1 to 3, each said groove (44 wherein; 134,136) has the cross section of substantial rectangular.

5. according to pavement marker arbitrary in the claim 1 to 4, its cover plate (14; 78) top cover (78) that is integrally formed and placed the top depression (124) on the base portion (72) by fluorescent material is provided.

6. according to pavement marker arbitrary in the claim 1 to 5; Wherein base portion (72) comprises the opposite side (104 of front surface (100), back surface (102) and extension between the front surface (100) of base portion (72) and surface, back (102); 106); Front surface (100) is formed with front lens recess (112), and front lens (74) is fixed in the lens recess (112) in the front surface (100) of base portion (72).

7. according to the pavement marker of claim 6, wherein front lens (74) is through in the gluing front lens recess (112) that is weldingly fixed on the base front surface (100).

8. according to the pavement marker of claim 6, wherein front lens (74) is fixed in the front lens recess (112) on the base front surface (100) through machanical fastener.

9. according to the pavement marker of claim 6, wherein the back surface (102) of base portion (78) is formed with rear lens recess (118), and pavement marker (10) also comprises the rear lens (76) in the rear lens recess (118) on the back surface (102) that is fixed on base portion (72).

10. method of making pavement marker, it comprises:

Form base portion (72), this base portion has bottom surface (88) and the opposite end face that is used to be placed on the road, and being formed on of base portion (72) defines depression (124) in its end face, and heart hole (126) extend into top depression (124) and by web (128) it are separated from each other;

Form cover plate (78), be used for covering the heart hole (126) of base portion (72);

Cover plate (78) is positioned on the base portion (72), so that cover plate (78) is engaged in the depression (124) in base portion (72) end face;

Apply ultrasonic energy to said cover plate (78), so that cover plate (78) is welded to web (128), wherein:

The step that forms base portion (72) comprises: form peripheral steps (130) and in web (128), form groove (134) around depression (124) periphery; Wherein peripheral steps (130) comprises whole peripheral groove (136) around depression (124) extension; And these grooves (134; 136) has opposite side

The step that forms cover plate (78) comprises: form to be processed and had by the material that is used to produce optical signalling and be used to embed groove (134; The cover plate (78) of energy drag rib (144) 136), energy drag rib (144) has the opposite side of the distance that is spaced apart from each other, and this distance is less than groove (134; 136) interval between the side; And energy drag rib (144) defines the cross sectional area of the cross sectional area that is substantially equal to groove (134,136), and

The step that applies ultrasonic energy is performed and is used for cover plate (78) is sealed in airtightly in the depression (124) and is used for the molten material fusing of energy drag rib (144) and fills corresponding grooves (134; 136), thus certain degree ground reduces the negative effect of ultra-sonic welded to cover plate (78) optical property.